1904] BRIEFER ARTICLES 385 
the season. Keeping the bottled water for months and even years 
does not alter its osmotic pressure appreciably. 
The conclusion to be drawn from the material just presented is 
simply that dog waters do not have an appreciably higher concentration of 
dissolved substances than do the streams and lakes of the same region. 
Thus we are driven to the idea that if there is any property of bog 
water which prevents ordinary swamp plants from growing therein, this 
property must rest upon the chemical nature of the very small amounts 
of dissolved substances present. The nature and physiological prop- 
erties of these bodies the writer is now studying.—Burton EpwarpD 
Livincston, Hull Botanical Laboratory, The University of Chicago. 
WILLIAM M. CANBY. 
(WITH PORTRAIT) 
THE announcement of the death of Mr. William M. Canby, of 
Wilmington, Delaware, will come as a personal loss to botanists 
throughout the country, for he 
has” been as well the intimate 
friend of many of them as a 
most generous contributor to 
all our public and private her- 
baria. Although Mr. Canby 
had not been in the best of 
health for some time, his con- 
dition was not such as to cause 
any serious alarm to his friends. 
On February 23 he went south 
for rest and change, but he con- 
tracted a severe cold, which was 
followed by a chill, and died 
very suddenly March to, at 
North Augusta, South Carolina. 
William Marriott Canby was 
born in Philadelphia, Pennsyl- 
vania, March 17, 1831, thus 
being nearly 73 years of age 
at the time of his death. He received his early education at the 
Friends School at Westtown, near West Chester, Pennsylvania, and 
from private tutors. 
